Wondering if anyone ever had the same problem as me. 2002 Explorer 4.6L 4x4. When I am driving I hear a loud thumping noise from what sounds like the front driver's wheel. The noise starts at about 20mph and is louder the faster I go. I can also hear a roaring noise, which sounds like a typical bad hub noise, but would a bad hub thump? It also feels like it's binding up, especially when taking a left, but the caliper isn't frozen. The noise is pretty consistent when going straight, it lessens a little bit when going right, and gets worse when taking a left or hugging a left curve. Last night I had to make a u-turn and when I cut the wheel all the way left and went the tire locked up, I would have sworn the tire fell off, but when I backed off the wheel a little bit it was fine again. I've replaced the 2 rear hubs and checked the front hubs and they have no play in them at all. Checked the front suspension, and nothing wrong there either. I recently had the driver's rear hub completely lock up on me so I thought about that, but when the front end is off the ground the tire spins freely by hand and there's no scraping noise coming from the hub. I think I can eliminate front differential issues because if I jack up one front tire it spins freely without the other side having to be off the ground, so I think that means that the differential only engages in 4wd. Please correct me if I'm wrong on that. My first guess was the hub, but I've never heard of a hub thumping or binding up when turning a certain way. I'm now thinking it might be the cv axle but I don't want to play "guess the part". Can anyone give me a suggestion? I don't have the money to bring it somewhere so I'm hoping someone else might have had a similar issue and can help me out. Thanks in advance for any ideas.